Headline Numbers

As of the latest CDC data release on July 30, 2020 there are:

Where I live, in Somerville, MA, as of July 29, 2020 there are:

Consequently, in the United States, there are now:

Globally, as of the latest WHO data release on July 31, 2020, there are:

Overall Covid Cases In The USA

Regions are defined as follows: Northeast (CT, ME, MA, NH, RI, VT, NJ, NY, PA), Midwest (IN, IL, MI, OH, WI, IA, KS, MN, MO, NE, ND, SD), South (AL, AR, DC, DE, FL, GA, KY, LA, MD, MS, NC, OK, SC, TN, TX, VA, WV) and West (AZ, CO, ID, NM, MT, UT, NV, WY, AK, CA, HI, OR, WA). The red line denotes the date that Health and Human Services (HHS) took over the production of data from the Center for Disease Control (CDC) on July 20, 2020.1

US Cases Compared to World Cases

Covid Cases in Somerville, MA and MA

Latest Cases in Boston Area (Today, One Week Ago, Two Weeks Ago)

Date County Name Cases Deaths New Cases New Deaths
July 30, 2020 Middlesex County 25617 1974 82 3
July 23, 2020 Middlesex County 25123 1951 39 0
July 16, 2020 Middlesex County 24685 1934 33 6
July 30, 2020 Norfolk County 10160 982 57 3
July 23, 2020 Norfolk County 9849 974 28 2
July 16, 2020 Norfolk County 9588 962 28 0
July 30, 2020 Suffolk County 21113 1055 83 1
July 23, 2020 Suffolk County 20732 1042 54 3
July 16, 2020 Suffolk County 20445 1027 34 3

New Covid Cases By State

The plot below shows the number of new COVID cases by state. Note that each figure has its own y axis; this is done so that trends can be seen within each state. Log scales can make the difference between 100 and 1000 cases hard to discern and a common y axis causes states like NY and CA to swamp states like NC. Negative new cases can occur when States revise their total number of cases downwards, as Hawaii did between June 30, 2020 and July 1, 2020.

COVID Cases per 1,000 Residents by State

This figure shows the number of COVID cases per 1,000.

Latest County Case Map

Latest County Death Map

Counties with the Most Cases Over Time

Date State County Name Cases Deaths
2020-07-30 CA Los Angeles County 185872 4552
2020-07-30 FL Miami-Dade County 115916 1515
2020-07-30 AZ Maricopa County 114852 2011
2020-07-30 IL Cook County 104687 4872
2020-07-30 TX Harris County 69126 1206
2020-07-01 CA Los Angeles County 105507 3402
2020-07-01 IL Cook County 90911 4581
2020-07-01 NY Queens County 65455 7059
2020-07-01 NY Kings County 59742 7104
2020-07-01 AZ Maricopa County 52266 817
2020-06-01 IL Cook County 78495 3658
2020-06-01 NY Queens County 62094 6271
2020-06-01 NY Kings County 56053 6742
2020-06-01 CA Los Angeles County 55968 2362
2020-06-01 NY Bronx County 45359 4480
2020-05-01 NY Queens County 52274 5111
2020-05-01 NY Kings County 45519 5320
2020-05-01 IL Cook County 38668 1673
2020-05-01 NY Bronx County 37785 3527
2020-05-01 NY Nassau County 36161 1720

Hospitalizations By State

Patients Currently in the ICU

Patients Currently on Ventilators

Cumulative Cases by County in the Northeast

Cumulative Cases by State Over Time

Cumulative Deaths by State Over Time

Daily Percent Positive Cases

According to the WHO the positive rate should be below 5%.2 Days above the threshold are denoted in red, days below are in blue. Note that the variables currently used for these plots –positiveIncrease and negativeIncrease– are being phased out and will be replaced by positiveCasesViral and negativeCasesViral. Each dot represents the rolling average of tests within the previous week (this approach smoothes out trends such as fewer cases being reported on weekends).

Partisanship and COVID Cases

Variants of Select Figures

Week to Week Changes in COVID Cases

Confirmed Cases as a Percentage of State Population

The two sets of points are confirmed cases (black), and potential cases (grey) which are confirmed cases times ten. For herd immunity, typically 70-90% of a population needs immunity.3


  1. See e.g., https://www.cnbc.com/2020/07/20/hhs-unveils-new-coronavirus-hospitalization-database-says-its-more-complete-than-cdcs.html

  2. https://coronavirus.jhu.edu/testing/tracker/overview

  3. See https://www.jhsph.edu/covid-19/articles/achieving-herd-immunity-with-covid19.html